Solvent Engineering for High-Performance Two-Dimensional Ruddlesden-Popper CsPbI3Solar Cells

Title

Solvent Engineering for High-Performance Two-Dimensional Ruddlesden-Popper CsPbI3Solar Cells

 Author

Chen, Haiqiang (Lanzhou University)
Lei, Yutian (Lanzhou University)
Yao, Huanhuan (Lanzhou University)
Li, Zhizai (Lanzhou University)
Peng, Guoqiang (Lanzhou University)
Zhou, Xufeng (Liaocheng University)
Wang, H. (TU Delft Photovoltaic Materials and Devices)
Wang, Qian (Lanzhou University)
Jin, Zhiwen (Lanzhou University)

Date

2022

 Abstract

Two-dimensional (2D) Ruddlesden-Popper (RP) CsPbI3 exhibits enhanced phase stability compared with 3D CsPbI3. However, the issue of the uncontrollable crystallization process limits its photovoltaic performance. Here, the influence of a binary mixed solvent on the film quality and photovoltaic properties of (PEA)2Cs4Pb5I16 (n = 5) is studied in detail. It is demonstrated that the crystallization rate and crystal growth can be controlled by adjusting the amount of dimethyl sulfoxide (DMSO). Optimizing the solvent composition with adding 10% DMSO in pure dimethyl formamide (DMF) leads to perfect coverage, larger flaky 2D grains, reduced grain boundaries, and a better vertical orientation to the substrate due to the formation of a more stable intermediate phase. This can form good interface contact, which is beneficial to charge transport/extraction between TiO2 (electron transport layer, ETL) and perovskite, finally resulting in improved device performance. The enhancement of the power conversion efficiency of the optimized device based on DMF/DMSO (9:1) is 3.57% compared with the reference device based on pure DMF. This work illustrates the role of crystallization kinetics in the RP CsPbI3 film and offers a simple and effective method for high-performance 2D CsPbI3 solar cells.


 Subject

2D inorganic perovskites
crystallization kinetics
intermediate phase
Ruddlesden-Popper phase
solvent engineering

 To reference this document use:

http://resolver.tudelft.nl/uuid:f59eb904-bdb1-4a59-920b-35d058a6ef18

 DOI

https://doi.org/10.1021/acsaem.2c02345

 Embargo date

2023-02-19

 ISSN

2574-0962

 Source

ACS Applied Energy Materials, 5 (9), 11807-11814

 Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2022 Haiqiang Chen, Yutian Lei, Huanhuan Yao, Zhizai Li, Guoqiang Peng, Xufeng Zhou, H. Wang, Qian Wang, Zhiwen Jin
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